LU, JIAFENG Visualization 5.avi Visualization 5: The video shows the spectrum evolution of mode switching process from OAM+1 to OAM0 via TS-DFT method. Lasers and Laser Optics 2020-07-02
    https://opticapublishing.figshare.com/articles/media/Visualization_5_avi/11498658
10.6084/m9.figshare.11498658.v1